After posting my last reply I found out what's going on with my Acer laptop. The Fn + F5 button doesn't work because it is being over-ridden by a system tray applet in the bottom right-hand corner. This applet looks like a blue square with a gray border, and is called "Intel extreme graphics 2 for mobile". It replaces the Fn + F5 hardware approach with a software approach.
Using this applet, I can direct the laptop's output to my TV. The only thing is that I first have to set my laptop's primary screen to a resolution that my TV accepts if I want to have the same display on both my laptop and TV.
This applet has lots of options for setting up both my primary and secondary displays, but up until now I've been ignoring it and didn't realize what it does.